Electrospun nanofibers of p-type BiFeO3/n-type TiO2 hetero-junctions with enhanced visible-light photocatalytic activity
Electrospun nanofibers of p-type BiFeO3/n-type TiO2 hetero-junctions with enhanced visible-light photocatalytic activity
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DOI：
10.1039/c4ra04258a
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发表时间：
2014-07
期刊：
影响因子：
3.9
通讯作者：
Yan Yongtao;Yingle Liu;Jianhong Wei;C. Pan;R. Xiong;Jing Shi
中科院分区：
文献类型：
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作者：
Yan Yongtao;Yingle Liu;Jianhong Wei;C. Pan;R. Xiong;Jing Shi
采用简单的水热法和静电纺丝技术成功制备了具有高可见光催化活性的一维BiFeO3/TiO2异质结构纳米纤维。结果表明，BiFeO3/TiO2纳米纤维长度可达数十微米，直径约为100-300 nm，其中BiFeO3纳米颗粒被锐钛矿型TiO2纳米晶体包围。与相应的纯BiFeO3纳米粒子和TiO2纳米纤维相比，制备的BiFeO3/TiO2纳米纤维在可见光照射下降解甲基蓝的光催化活性明显增强。光催化活性的增强是由于BiFeO3和TiO2之间形成了p-n异质结，从而产生了协同增强。值得注意的是，由于BiFeO3/TiO2纳米纤维的一维纳米结构特性，其光催化活性不会降低，可以很容易地回收。BiFeO3/TiO2异质结构纳米纤维具有较高的降解效率和良好的可回收性，在光降解各种有机污染物方面具有广泛的应用前景。
One-dimensional BiFeO3/TiO2 heterostructure nanofibers with high visible-light photocatalytic activity have been successfully obtained via a facile hydrothermal process followed by an electrospinning technique. The results show that the BiFeO3/TiO2 nanofibers are as long as dozens of micrometers with the diameters of about 100–300 nm, where BiFeO3 nanoparticles are surrounded by anatase-type TiO2 nanocrystals. Compared with the corresponding pure BiFeO3 nanoparticles, and TiO2 nanofibers, the as-prepared BiFeO3/TiO2 nanofibers exhibit a markedly enhanced photocatalytic activity in the degradation of methyl blue under visible light irradiation. The enhanced photocatalytic activity is attributed to the formed p–n heterojunction between BiFeO3 and TiO2, which results in synergistic enhancement. Notably, the BiFeO3/TiO2 nanofibers could be easily recycled without the decrease in the photocatalytic activity because of their one-dimensional nanostructural property. With their high degradation efficiency and fine recyclability, the BiFeO3/TiO2 heterostructure nanofibers will have wide application in photodegradation of various organic pollutants.